mkropat

function d(str) {
    console.log(hexdump(decode(str)));
}

function decode(base64) {
    base64 = base64 || '';
    return atob(base64.replace(/_/g, '/').replace(/-/g, '+'));
}

function hexdump(buffer, blockSize) {

igorgatis

function hexdump(buffer, blockSize) {
    blockSize = blockSize || 16;
    var lines = [];
    var hex = "0123456789ABCDEF";
    for (var b = 0; b < buffer.length; b += blockSize) {
        var block = buffer.slice(b, Math.min(b + blockSize, buffer.length));
        var addr = ("0000" + b.toString(16)).slice(-4);
        var codes = block.split('').map(function (ch) {
            var code = ch.charCodeAt(0);
            return " " + hex[(0xF0 & code) >> 4] + hex[0x0F & code];